Abrasive wheel and method of making the same



J. R. O'NEIL, JR, ETAL 3,200,543

ABRASIVE WHEEL AND METHOD OF MAKING THE SAME 2 Sheets-Sheet l INVENTORS JOSEPH R. O'NEIL JR. ALPHONSE J. KIRSCH w. BUELL HALSEY ATTORNEY Aug. 17, 1965 Filed April 18, 1962 Aug. 17, was

ABRASIVE Filed April 18, 1962 J. R. QNEIL, J., ETAL.

WHEEL AND METHOD OF MAKING THE SAME 2 Sheets-Sheet 2 INVENTORS JOSEPH R. O'NEIL JR. ALPHONSE J. KIRSCH HALSEY w. BUELL vffii ATTORNEY United States Patent 3,200,543 ABRASIVE WHEEL AND METHOD OF MAKING THE SAME Joseph R. ONeil, Jr., Youngstown, N.Y., Alphonse J.

Kirsch, Geneva, Switzerland, and Halsey W. Buell, Niagar-a Falls, N.Y., assignors to The Carhorundum Company, Niagara Falls, N.Y., a corporation of Delaware Filed Apr. 18, 1962, Ser. No. 188,351

4 Claims. (Cl. 51--337) This invention relates generally to abrasive wheels, and more particularly to an abrasive wheel having a male and a female hub section which may be detachably connected to one another to clampingly'mount a plurality of abrasive coated leaves which have been loaded between the hub sections to constitute an annulus of abrasive coated leaves.

The invention also relates to the annulus of abrasive coatedleaves bonded'together at their inner edges by a collar of substantial thickness of hardened adhesive resin poured in place and conforming at its inner periphery to a sleeve of the female hub section.

' Theinvention also relates'to a method of making the annulus of abrasive leaves with an integral collar, and to the method of making the abrasive wheel.

In the accompanying drawings, which illustrate a preferred embodiment of the invention:

FIGURE 1 is a plan view of an abrasive wheel;

FIGURE 2 is a'section taken on the line 11-11 of FIG- URE 1, on an enlarged scale;

FIGURE 3 is a section similar to FIGURE 2, but with the'rnale hub'section removed and showing the parts in position before the hardenable adhesive nesin has been poured in place;

FIGURE 4 is a plan view of one of the abrasive coated leaves, on a still larger scale; a Y 1 FIGURE 5 is a plan View of the annulus of abrasive coated leaves, the inner edges of which are bonded by a collar of hardened adhesive resin poured in place and conforming at its inner periphery to a sleeve of the fe male hub section; and

FIGURE 6 is a section taken on the line VIVI of FIGURE 5, on an enlarged scale.

Referring more particularly to the accompanying drawings, the abrasive wheel comprises a female hub section designated generally by reference numeral 2, having an axially extending sleeve 4 and a radially extending flange 6 which extends outwardly beyond the sleeve 4. The inner face of the flange 6 has a circular rib 8 which is concentric with the longitudinal axis XX of the abrasive wheel.

A male hub section designated generally by reference numeral 10 has an axially extending sleeve 12 which fits in and cooperates with the sleeve 4 of the female hub section 2. The male hub section 10 has a radially extending flange 14 which extends outwardly beyond the sleeve 12 and beyond the sleeve 4 and is provided on its inner face with a circular rib 16 which is concentric with the longitudinal axis XX of the abrasive wheel and is in axial alignment with the circular rib 8 of the female hub section 2.

An annulus 18 of abrasive coated leaves 20, one of which is shown in FIGURE 4, has an annular collar 22 of hardened adhesive resin which bonds the inner edges 24 of the leaves. This collar 22 is of substantial thickness, say of the order of A", and is made by pouring hardenable adhesive resin into the space 19 between the inner periphery of the annulus 18 and the outer periphery of the sleeve 4 of the female hub section 2. In this manner, the inner periphery 25 of the collar 22 conforms to the outer periphery 4a of the sleeve 4.

Each lateral edge 26 of each of the leaves 20 is pro- 3,288,543 Patented Aug. 17, 1965 more pouring openings 30 through which the hardenable adhesive resin which forms the collar 22 is poured. The male hub-section 10 is provided with a plurality of boltreceiving bores 32 and the female hub section 2 is provided with-an equal number of threaded bolt-securing holes 34, so that the two hub sections 2 and 10 can be resin can be made in the following manner.

-' 2.4 of the annulus of abrasive coated leaves.

All surfaces of both the male and female hub sections which may come in contact with the hardenable adhesive resin are coated with a release agent, such as silicone grease, before assembly, to prevent adhesion between the hub sections and the hardened adhesivev resin. 7

of the female hub section 2 with the circular rib. 8 fitting into the notch 28.0f each leaf 20, and with the inner edge .24 of each leaf spaced from the outer periphery 4a of the sleeve 4. After a complete annulus of abrasive coated leaves Ztlhas been loaded onto the hub section2, a gel coating or thin thixotropic coating of hardenable adhesive resin is applied to the inneredges This coating effectively prevents penetration of the pourable adhesive resin between the abrasive coated leaves 20. The male hub section 10, then is placed in position with its sleeve 12 fitting'into the sleeve 4 of the female hub section 2 and with the circular rib 16 fitting into each ofthe notches 28 of each leaf. .Bolts 36 are inserted into the bores 32 and threaded holes 34 and turned so as to draw the hub sections 2 and 10 together. Hardenable adhesive resin is then poured into the space 19 between the router periphery 4a of the sleeve 4 and the inner edges 24 of the leaves 20, and allowed to harden. The bolts 36 are then removed, the male hub section 10 is removed, and the annulus 18, together with its integral collar 22, is removed from the female hub section 2. After heating to further harden the resin, if heating is required, the annulus 18 can be mounted between a male and a female hub section similar, respectively, to hub sections 10 and 2 with the collar 22 fitting over the sleeve of the female hub section. When so mounted and the bolts tightened, the circular ribs 16 and 8 on the male and female hub sections 10 and 2, respectively, fit into the circular grooves formed by the notches 28 formed in each lateral edge of each leaf 20.

The adhesive resin of which the collar 22 is made is of such character that it does not impregnate the abrasive coated leaves 20 to any appreciable extent. If this were to occur, it would cause embrittlement of the abrasive coated leaves and would tend to cause them to fall out when in use and create a real hazard due to the high speeds at which these wheels are operated.

The adhesive resin which forms the collar 22 is preferably a urethane resin or a combination of a urethane resin and an epoxy resin. A preferred formulation is parts of Adiprene L-100 and 11 parts of Moca as a curing agent. Adiprene L-l00 is polybutyletherglycoldiisocyanate. Moca is a diamine. More specifically, it is 4,4-rnethylene-bis, 2,2 chloroaniline.

When an epoxy resin is added for hardness, Epirez 510 or Epon 828 may be employed. Those epoxy resins are preferred which have an epoxy equivalent from about 174 to about 195. By epoxy equivalent, as the a term is used herein, is meant grams of resin containing 1 gram-equivalent of epoxide. When an epoxy resin is added, additional Moca is used to provide catalysis of both the urethane constituent and the epoxy resin constitucnt.

Preferred amounts of the above-mentioned ingredients include from about 60 to about 100 parts by weight of polybutyletherglycoldiisocyanate, about 11 to '28 partsby weight of 4,4 methylene-bis, 2,2 chloroaniline, and about 1 to 40 parts by weight of the epoxy resin.

The following table gives three examples of suitable resins which may be employed according to the present said sleeve, a male hub section including an axial sleeve and a radially extending circular flange projecting beyond its sleeve, a circular rib formed on the inner face of said flange of said male hub, section concentric with' the longitudinal axis of the Wheel and located adjacent said last mentioned sleeve, a replaceable abrasive wheel unit comprising an annulus of abrasive coated leaves, the inner ends of said leaves being bonded solely at their inner edges invention, the amounts of the ingredients being given in parts by weight. The table also gives the curing temperature and time, the epoxy equivalent of the epoxy resin and the hardness of the three resins after curing.

Weclaim:

1. A replaceable abrasive wheel unit comprising an annulus of abrasive coated'leaves, said leaves being bonded solely at their inner edges by a unitary cylindrical collar of substantial thickness having its ends normal to the axis thereof, said collar being formed of'hardened adhesive resin poured in place andconforming at its inner periphery to a sleeve of a hub'sec'tion on which the wheel unit is adapted to be mounted, and a circular groove formed in each lateralface of said annulus. concentric with the longitudinal axis of the Wheel unit and adapted to receive a circular rib formed on a radially extending flange of a hub section.

2; An abrasive wheel comprising a female hub section.

including an axial sleeve and a radially extending circular flange projecting beyond said sleeve, a circular rib formed on the inner face of said circular flange concentric with the longitudinal axis of the wheel andlocated adjacent by a collar of substantial thickness of hardened adhesive resin, said leaves having a length'several, times greater than the radial thickness of said collar, said collar being formed by said adhesive resin being'poured in place and conforming at its inner periphery to the sleeve of said female hub section, and a circular groove formed in each lateral face 'ofsaid annulus concentric with the longitudinallaxis of said wheel unit and adapted to receive said circular rib, said replaceable abrasive wheel unit being secured in place between said female and male hub sections with the, circular ribs of's'aid hub sections fitted'in the circular; groovesformed in said annulus:

3. A replaceable abrasivewheel unit according to claim 1, wherein the hardened adhesive resin of which said collar is made does-not impregnate said abrasive, coated leaves to any appreciable extent;

4. An abrasive Wheel according to claim 2, wherein the hmdened adhesive resin of which said collar is made does not'impregnatesaid abrasive. coated'leaves to any appreciable' extent.

References Cited by theExalniner UNITED STATES, PATENTS I FOREIGN PATENTS 112,030 10/44 Sweden. ROBERT c; RIORDON, Primary Examiner.

FRANK H. BRONAUGH, LESTER M. SWINGLE,

' Examiners. 

1. A REPLACEABLE ABRASIVE WHEEL UNIT COMPRISING AN ANNULUS OF ABRASIVE COATED LEAVES, SAID LEAVES BEING BONDED SOLELY AT THEIR INNER EDGES BY A UNITARY CYLINDRICAL COLLAR OF SUBSTANTIAL THICKNESS HAVING ITS ENDS NORMAL TO THE AXIS THEREOF, SAID COLLAR BEING FORMED OF HARDENED ADHESIVE RESIN POURED IN PLACE AND CONFORMING AT ITS INNER PERIPHERY TO A SLEEVE OF A HUB SECTION ON WHICH THE WHEEL UNIT IS ADAPTED TO BE MOUNTED, AND A CIRCULAR GROOVE FORMED IN EACH LATERAL FACE OF SAID ANNULUS CONCENTRIC WITH THE LONGITUDINAL AXIS OF THE WHEEL UNIT AND ADAPTED TO RECEIVE A CIRCULAR RIB FORMED ON A RADIALLY EXTENDING FLANGE OF A HUB SECTION. 